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1. (WO1991018212) HYDRAULIC SYSTEM
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1991/018212 International Application No.: PCT/JP1991/000641
Publication Date: 28.11.1991 International Filing Date: 15.05.1991
IPC:
F15B 11/16 (2006.01) ,F15B 13/04 (2006.01)
F MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
15
FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
B
SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
11
Servomotor systems without provision for follow-up action
16
with two or more servomotors
F MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
15
FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
B
SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
13
Details of servomotor systems
02
Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
04
for use with a single servomotor
Applicants:
KABUSHIKI KAISHA KOMATSU SEISAKUSHO [JP/JP]; 3-6, Akasaka 2-chome Minato-ku Tokyo 107, JP (AllExceptUS)
AKIYAMA, Teruo [JP/JP]; JP (UsOnly)
SHIRAI, Kiyoshi [JP/JP]; JP (UsOnly)
ISHIZAKI, Naoki [JP/JP]; JP (UsOnly)
YAMASHITA, Koji [JP/JP]; JP (UsOnly)
SHINOZAKI, Shinichi [JP/JP]; JP (UsOnly)
Inventors:
AKIYAMA, Teruo; JP
SHIRAI, Kiyoshi; JP
ISHIZAKI, Naoki; JP
YAMASHITA, Koji; JP
SHINOZAKI, Shinichi; JP
Agent:
KIMURA, Takahisa; 6F Ginza Daisaku Building 11-2, Ginza 2-chome Chuo-ku Tokyo 104, JP
Priority Data:
2/12295115.05.1990JP
2/12295515.05.1990JP
2/12295615.05.1990JP
Title (EN) HYDRAULIC SYSTEM
(FR) SYSTEME HYDRAULIQUE
Abstract:
(EN) A hydraulic system (1) according to the first invention, wherein intermediate pressures between pressures at the inlets and the outlets of first and second pressure compensated valves (4), (4') are caused to act on pressure-receiving surfaces (4b), (4b') on the flowrate decreasing side through first and second intermediate pressure supplying means (13), (13'), so that errors in operation and malfunctions of the pressure compensated valves (4), (4') can be controlled. A hydraulic system (20) according to the second invention, wherein control valves (3), (3') are in neutral positions, holding pressures of hydraulic actuators (5), (5') are caused to act on pressure-receiving surfaces (4b), (4b') on the flowrate decreasing side of the compensated valves (4), (4') so as to hold a spool in a position of compensation, so that responsiveness of the hydraulic actuators (5), (5') to the lever operations can be improved. A hydraulic system (30) according to the third invention, wherein at least one of the areas of the pressure-receiving surfaces (4a), (4a') on the flowrate increasing side of the pressure compensated valves (4), (4') is set larger than the area of the pressure-receiving surfaces (4b), (4b') on the flowrate decreasing side so as to decrease the accuracy of the pressure compensation, so that the maximal operation speeds of the hydraulic actuators (5), (5') can be prevented from being lowered.
(FR) Dans un système hydraulique (1) correspondant à la première invention, les pressions intermédiaires entre les pressions aux entrées et aux sorties de premières et deuxièmens soupapes compensées en pression (4), (4') agissent sur les surfaces recevant la pression (4b), (4b') du côté réducteur de débit par l'intermédiaire des premier et deuxième organes d'application de pressions intermédiaires (13), (13'), de sorte que les erreurs de fonctionnement et les pannes des soupapes compensées en pression (4), (4') puissent être détectées et éliminées. Dans un système hydraulique (20) correspondant à la deuxième invention, les soupapes de commande (3), (3') se trouvent dans des positions neutres et les pressions de maintien des actuateurs hydrauliques (5), (5') agissent sur les surfaces recevant la pression (4b), (4b') du côté reducteur de débit des soupapes compensées (4), (4') de manière à maintenir une pièce d'espacement dans une position de compensation, afin d'améliorer la réaction des actuateurs hydrauliques (5), (5') à l'actionnement par levier. Dans un système hydraulique (30) correspondant à la troisième invention, au moins une des zones des surfaces recevant la pression (4a), (4a') du côté augmentant le débit des soupapes compensées en pression (4), (4') est plus étendue que la zone des surfaces recevant la pression (4b), (4b') du côté réducteur de débit des soupapes compensées (4), (4') de manière à réduire la précision de la compensation de pression, afin d'éviter de réduire les vitesses maximales de fonctionnement des actuateurs hydrauliques (5), (5').
Designated States: KR, US
European Patent Office (AT, BE, CH, DE, DK, ES, FR, GB, GR, IT, LU, NL, SE)
Publication Language: Japanese (JA)
Filing Language: Japanese (JA)
Also published as:
EP0536398US5271227KR1019920702755